Update README with two caveats for Mac builds (case-insensitive FS and linker OOM with noopt).
Fixing formatting in README.md.
Removing TODOs accidentally left in README.
Merge pull request #255 from jlebar/readme-updates

Update README with two caveats for Mac builds (case-insensitive FS and l...
Add support to helix.
Add Nexus 4 and JB emulator build support
Run b2g-info when doing a memory report with get_about_memory.py.
Update tools/get_about_memory.py so it can pull GC/CC logs, with the --gc-logs option.
Revert "Update tools/get_about_memory.py so it can pull GC/CC logs, with the --gc-logs option."

I am an idiot; I already wrote a tool to do this, called get_gc_cc_logs.py.

This reverts commit b0aab814e42eb07ded086de010cffca88eb310d5.
Unbitrot get_gc_cc_log.py, so it works again.